Submission #689809

#	Time	Username	Problem	Language	Result	Execution time	Memory
689809		KiriLL1ca	Bigger segments (IZhO19_segments)	C++17	13 / 100	1 ms	468 KiB

segments

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fr first
#define sc second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pw(x) (1ll << x)
#define sz(x) (int)((x).size())
#define pb push_back
#define endl '\n'
#define mp make_pair
#define vec vector

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef unsigned long long ull;

template <typename T> inline bool umin (T &a, const T &b) { if (a > b) { a = b; return 1; } return 0; }
template <typename T> inline bool umax (T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }
template <typename T>
using oset = tree<T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

struct st {
        int n; vector <ll> t;
        st (int n = 0) : n(n), t(4 * n, 1e18) {}
        inline void upd (int v, int tl, int tr, int pos, ll x) {
                if (tl == tr) { t[v] = x; return; }
                int tm = (tl + tr) >> 1;
                if (pos <= tm) upd(v << 1, tl, tm, pos, x);
                else upd(v << 1 | 1, tm + 1, tr, pos, x);
                t[v] = min(t[v << 1], t[v << 1 | 1]);
        }
        inline int get (int v, int tl, int tr, ll x) {
                if (tl == tr) return tl;
                int tm = (tl + tr) >> 1;
                if (t[v << 1 | 1] <= x) return get(v << 1 | 1, tm + 1, tr, x);
                else return get(v << 1, tl, tm, x);
        }
        inline ll getp (int v, int tl, int tr, int pos) {
                if (tl == tr) return t[v];
                int tm = (tl + tr) >> 1;
                if (pos <= tm) return getp(v << 1, tl, tm, pos);
                else return getp(v << 1 | 1, tm + 1, tr, pos);
        }

        inline void upd (int pos, ll x) { upd(1, 0, n - 1, pos, x); }
        inline int get (ll x) { return get(1, 0, n - 1, x); }
        inline ll getp (int i) { return getp(1, 0, n - 1, i); }
};

inline void solve () {
        int n; cin >> n;
        st s (n + 1); s.upd(0, 0);
        ll sum = 0;
        vector <int> dp (n + 1); dp[0] = 0;
        vector <ll> pref (n + 1);
        for (int i = 1; i <= n; ++i) {
                int x; cin >> x; sum += x;
                int p = s.get(sum);
                dp[i] = dp[p] + 1; pref[i] = sum;
                s.upd(i, sum * 2 - pref[p]);
        }
        assert(dp[n] <= 40);
        cout << dp[n];
}

signed main() {
        ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
        #ifdef LOCAL
                freopen("input.txt", "r", stdin);
                freopen("output.txt", "w", stdout);
        #endif
        int t = 1; // cin >> t;
        while (t--) solve();
        return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27